Mechanisms of Stereomutation and Thermolysis of Spiro-1,2-oxaphosphetanes: New Insights into the Second Step of the Wittig Reaction
作者:Jesús García López、Antonio Morán Ramallal、Javier González、Laura Roces、Santiago García-Granda、María José Iglesias、Pascual Oña-Burgos、Fernando López Ortiz
DOI:10.1021/ja307330c
日期:2012.12.5
The experimentally observed stereomutation of spiro-1,2-oxaphosphetanes is shown by DFT calculations to proceed through successive M-B2 or M-B4 and M-B3 mechanisms involving two, four, and three Berry pseudorotations at phosphorus, respectively. Oxaphosphetane decomposition takes place in a single step via a polar transition state. The calculated activation parameters for this reaction are in good agreement with those determined experimentally.